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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9079e09a75c50e2cd167018ee798fa569a37270384a2ab6fa23a5c9951c270c' 
  AND token = 'LRihPkMmImxJ+CLUP+eJNZvDehQHG8c7Z7htlmbPjAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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