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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e08cbc58a35bef28b6003567eaff554f4a38df76c338a7d61ccec636b4d7f946' 
  AND token = 'WZ7Df7R2hr5ddSdLBxjukSlQmKMxuObeeyCK41YKqgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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