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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8411a8f8cb07ee841605e9e19b3f9cd15dc09e94f98b8254eebed7305b7f148d' 
  AND token = 'hDOsvcIDAui3tiDMQb/YG64UE9CVprQ8v1+Btt0oGFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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