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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14671147f5f1d1e6db98ad0da2ad5c80e7c612baa4b64fd224cb3f7a0c085aa' 
  AND token = 'XQPliij+G5EXwWJF3svq0QNLP4/ma29cxtcRz/MD+Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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