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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc96951a350a42388e0c80af91b3a66a24aeed58d3cf1f78b74b5c6a280655a' 
  AND token = 'VXHrnhiX/1LlLS0l3pE69lhjqMvlqsMma0kksg2gQFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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