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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe81e21f7a2efb0e4a338ac3f62ffa23988b176bff0d0310a17f7e99a1680b2' 
  AND token = 'o5YV1xhhjjqnRxrp79D6V8bi0aem3ed8G9p3lhwt2Hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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