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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c397bc6d52e694eefc4cf725bde8b32aab3ba71e584aeaa4d58be570ae9f2585' 
  AND token = 'h9mepoFAYfdV+pzE15GztOnMqcM9qjOZqL7L3bOVmGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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