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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5507c9a2ca682a637f708da32e98f61a110292dcc566bd7ccbbaddeaa8c769' 
  AND token = 'YvBjtKPwISST0lndj13so0uHnHeqJzC7PnQTdCGPI7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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