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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a27d12998c03d40dcc7c985b5bf0e83236290c4a6ab5aba85c5ae6a2ddb84875' 
  AND token = 'bSuw6vLmtI4Y1eu3Yum4a+DEzQhdwzBeqrhLTbW6SRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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