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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87ddbf4b9fa9da7717041372ee78b816eb966ef5e9c5726924d5dca2ed3b120' 
  AND token = '+m1Ngwx4PE9pDRy5TcJ7LTPavjUoZ/ajxAB+1yXievY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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