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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd99514751342dbefbccf2ca4c7cf523b5c9b9fdfd93a96cb57674a5a951c3b5f' 
  AND token = 'cI7LqWNeMKWviie9rzxZjH1YS1xuBPLQN29dQj8/Rh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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