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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2ac560ccaf7a33081664df7cffa1d2a9d93bded612b3fc1e73a8b423f72e7f' 
  AND token = 'mqKrKvIRAHISMTlvOiDf34s5eqL3IpTgN5UbLo1E/7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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