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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf93f319ff0c51df74fc3328d139e93acf2da13effa29a7868e4e464eb8e096' 
  AND token = 'PyE/DFXU1e3yVJwoi5FZGRAVXnjXoPjbLBdX/iaE2JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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