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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91c52397e7adb8f67b5e6282bfa983f4dba8e99e7294490441e787969f40b83' 
  AND token = 'hJIWfQ6krkm/OrlCTAwbSh24rn8JlUlTzpQunaJog2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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