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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c2c62ab7c530b6c6ae6b25c57c4c251624a53853fea2f447c814fb65f5ce4f' 
  AND token = 'Rw8Wy8z1sxz4DupH/+ZxvBCVeBbxXnsFE6LjllfzRXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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