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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38e11531ffafd47878c34a2bd4eb75d541bb8e2b9db85bddb615d5b9c4469f65' 
  AND token = 'WBs8OytAJmo8NSuu9ywH+bqWMVxkOrjcyLq685k6I5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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