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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ae32939239cdba87ffa42f5e5aa6615c32b9f64dfc4f8495f37efad1f1b21f' 
  AND token = '7bnOfYWcGuWRqY2FP3RIEwKmVcDKr664EQmbGJtMsgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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