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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600f78b9ebad5171d65e3727a6030b3dfd97bc08c010561f76db9f0c21168b95' 
  AND token = 'BAIPbvU59/TYLrg+eQ9vSPA6wHmjybOw1kEgaBLFWdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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