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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07e5297a68c0b24df06263f280b8d08037103b6a848e301f23ff62da6dc803b' 
  AND token = 'g3fbOHYm74Eu/cv17T857ZGn1+s5ngEO+8MyCsQzm0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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