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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa57b0134ad2f85fb1367ba0572d4182fa2b6dd7ee674b1b9fcc39907b31ba6' 
  AND token = '82LU8+K0+aLW9yKyURet1cHRMa0Y9XRnTd2lPw0nwoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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