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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fee7e0bdfaa578ef438f8d9467a2c120007646deda60a89d01f76c5dc5817c96' 
  AND token = 'Ssjq/FdSjTWcJe+lcBFZ4zsVtydiwi9dWwpWmuB2aW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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