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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d39435ba6a2691b3e1a829cf17b613131fffa51bd03a70d0fa04a1eaf9bf31' 
  AND token = 'aAsP3OG2WshozeZIsc+rk65MZa3rzMPRrkjH0f/IyMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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