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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e2b762f700f726fb846bf0fb3a7cbc5f2902b137f704a3ce58553c777b48bd' 
  AND token = 'gCVMbhAf8gxewHU8jpwDHZwmZ2VjoXsf3RHncbgnKjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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