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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05c9fb0c77e9f9a5986c0e469dafdbef557bbc6a6c736c9db38db4d09fe94bec' 
  AND token = 'LlrMaV8mUHsGdisQB9V/rnP4FYY0jbuGmuBJu6PiaYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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