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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59091142795bb198b2f1b4a4b1938f8aa88d7c97b72c06824c35719b0c8b6810' 
  AND token = 'UBmvwlvGcJklGHFd7yUb4J0ybUCnMis3Sbq2Y/eNU4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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