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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '238b4026a7dd2e6fb13dfa348a1fcccf9e2a562293a628baf546b6caf3d99daf' 
  AND token = 'f5DGw9WjogytyHxD1B2vRkDHIBogNi9+tuHcFNrzv5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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