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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2c86163dd4a41078cb9ae3a7e6806515320e371767bea4f7b260756632fc48' 
  AND token = 'phb7Ry+HarOYThGBGZa3RAccrRW6GAaj7dewW+Dqpzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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