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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acb37fdc675fc928594fbd621ae92a581c9b951791717e259c3a2dfc2b559b64' 
  AND token = 'QF96kBMD8AkkPrrsQHBOI5ecPP9brVs5IXk6r9usVfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00149

JSON explain

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