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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401f847a6bb87d5093423112af3c35a1f45d0f4c31bd569b619b2198ecfb86f2' 
  AND token = 'AFOi+8VK9d8CumNEzCef3uqGTHAO8w442S8CjT/Ocgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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