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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3d226a42ddbf318e3f9e0fe8ceeb69731fc2eb8c84583e6e9f515e87cf17fb' 
  AND token = 'I9pJdTHoWVvQ6irqrpuBw8+xNc6m6wMNSRbs5V6CWYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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