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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d774d952d0b4e9c3a3288d87ee95a64badf03d9d11d46ca5431e7ee4f437724' 
  AND token = 'U7SXIwikaLu63l4s8sHcaVMOQrP8ekj1SZKFKn6bLxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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