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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37023727feae7ef09cb7bf7a3810aa81eba8fb708ec3add1237111a0f1a3a2f' 
  AND token = 'QW++V6aJl41c8EAi2V1pYHrfCX386C7uTXt3vos19/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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