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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11ddd8cf7a592bfb22d93d0a2d17e89dda93fbe1b7383182e252cc5078a6d68' 
  AND token = '1HuEbDWwWncdaB7iI6J5etkbfvBgKWQ1IPlqOeh/CQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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