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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfb01d7d7962a9f0df0502e17dd33b242b37446f8fb39667bb7d222009a310e2' 
  AND token = 'UkbwIb0rem2n0YI4Qa3A8GojvJaWImJJHVI49je9zpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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