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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9952a5df65eaa1f9afe7772eb34497f32a5f84bd5521fcdee34b2afd082ae7d' 
  AND token = 'vo71mapy4SkcGcUJGbq8KQXHlxDVZZTNoAUab2sc7zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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