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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fd4373f11ee59939b9ecd0f0b3b89073f8671ebef1a087fc8574cf54710ce2' 
  AND token = 'aE80on38oafiARzR0Gu9dpnvZsU3vJHYYi8z5yscV3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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