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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27845ab9dea4b7667cdcf16a992291e37dc8be8856a7e3788eb4334032ced840' 
  AND token = 'Z4FeJ9eVaGR3IE36s5Vnjgf8w4XD4grMtVGWaOwQN8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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