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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85dd273089e541634ddc1532072a4e582352bba99c81d687eb2cc3eb000730b4' 
  AND token = 'yIaHqYgZqFy4SIdgKCCTQZ+WMdtjXiFQF4DV8xLtzQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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