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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cae66a00519a679fef1fcbff9f87c71f0b8f2ad67e1d0c184300da104691eb56' 
  AND token = '7DiMEip4Kum5qJK8yiPVX5NumW3lDlHAxEopeIuAc18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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