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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54fb852707be6beed530e11712e590e7c61b07717783edf238bf68c67317e04c' 
  AND token = 'sCPaJS2R83xewwKLsIuJeukn8mJcOh2UKGyKLv2Bfm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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