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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b19bdcdbd8e4f3085c8ce7946d299bd45ca4f6f7bfbfba14ced515cd9b9ed22' 
  AND token = 'RAg3ZRp74KJFiAXq7L/pXNSpa3Y3I5ewNmFTUtl5VbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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