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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a68aae1fb10f21d08415921baaae1156ba1255740bfc0f688bcfed0c2701d919' 
  AND token = 'tHbAMeBz4KKQBWV5amW4uyTqRuqOwyBR3QJ6gezURgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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