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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '561b0f4fcaf726fc2ebf4b2552f6aba5381a9d45fc8fea44cc3c02912d61d512' 
  AND token = 'noMrl1FPp8tj6cK5C0+1qy3gz+LqVH3bkrgRJCq9Px8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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