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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3b2cb0e662da73a7d88c08addaf1faec8ccae50b31b4cfc0078defd31aaf1c' 
  AND token = '93IQXs29nF0lOI/ltQ92UzWUbMu/5hbzyT2gFQ/aTKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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