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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a9d057528243b35e92f5208f616fda223a313928f879b9bfd11b4112aa3d41' 
  AND token = '4rIgNQg8VdHOE4DdQdE7Aag0WpEvRkoKNkgKp0snPng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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