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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0558f190618b83bdb497f7971365625bb396f95e6eaf5d7d48ceace0a7aebc3a' 
  AND token = '6TxWTSzlaxY5NEMYDLR/52N9kZXt03GSkp3Y/0q0muA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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