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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ae73951e54bc7b8926dfbb68c7bd0756769d922eeb477423c6662ed57fd81e1' 
  AND token = 'Lb31vpU2MgjIMMXv2EeQbYy2JcS7Im1ECCpDce9CW7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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