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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa47deda12806a732e0eea7d349b817267636c83080eb378b41429ac7df2e1b9' 
  AND token = 'jAj8kdzrF+EC8GqfUjTZFi7eQ9dTa+LPQW6bqOZC+hw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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