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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fd7b6448c5b2761204005b7ff5503f443e35179e7014354d5252a2b64cf30d9' 
  AND token = 'ZPlxBCgVGMdPBDBluEFyXoC30KAwg8B3lN9MAiiDW4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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