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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ba53494907cecc463c9ccafec6499a59ce3ebaf9d99b8a2cf2aed6d64c77655' 
  AND token = 'ccGS0ows7llOtQMshjDIHCLZUZYXzqgcA2jFXpVEA2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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