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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02555f8d25563ac0133f7d0718688db19c45feb68e36e8cac0225ac888c0d79' 
  AND token = '6qUit9ZEsYnD1n8a5LxkVIfAXp3IEWufdltKrfm2HFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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