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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac9f4ffd73f342862ce06c67d058fe3994219e4e569414c973fdb06c1c74a0c' 
  AND token = 'Y2lqtoWspJ4Z48pcfiE4wKlNdHvXBftC/HIe9AQjmXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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