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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '964731a8df92beea04a0773622a33dd0cfa03991a6b46beafbf4fbc06b15e846' 
  AND token = 'uDsfCPBeNZznceuP65E93PnhZ3F1sb4hGt6nENernSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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