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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92219bd3eac9611ecefb6a67c96f5d65d0b52386b74cd3f7c0ae7cb82acc9099' 
  AND token = 'oiFsLWP+SWVqEBZLjIP51UzbgcOtFoJ5dRZyeDNLFCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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