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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b935c2e7d20b5cb77f3851ef475ff7e1ab851b6df25401e9b64b99ad271af6' 
  AND token = 'C5BEe7iPpsReOqrwZBVbuf/CfXPu6aHT8qf0C62nw7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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