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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba26bd0d88faa973a551ccdf45103581b516f25335f423bbba9f8b598cb33551' 
  AND token = 'uTD5b2V1tfShmr7qhrDU1nAPwoLh1YdWV5D175/pVVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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