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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e0ab29054f6ba033696d734bf3dcf50eab7ba880e5bc7b5d0b2bbddbd5d3f2' 
  AND token = 'qfMzzM6V6zCUgT1tkTCqPqYJkUipAJoSjmPbKXS3NHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}