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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbc168fc6d37e8781803d9628ab90150b77836bb557a0d6ef98ab6a8c7a9227' 
  AND token = 'vGK0wAMKOv52pXLoMhrU7ZJ8Ck3x1yKZkQ5iGzCZ9gM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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