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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfe867aa8a76782fff789b0d93f048727eb8a3ca36f08ff60c039fdcba9d87a' 
  AND token = 'DImED1qPdePoydsW8wBE4Zu9KK9zCh7q7R/poV+B+Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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