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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c8cc837f3c56ee97846abe087f0816c2ff0706c8674d531cd138b8de5f3f8c' 
  AND token = 'u8k6GdJjsRUllilfAeNG+hRWDFbvxDiZh/QzvfiB8gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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