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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef6b7277c00c290c59b9235ade4af1f91db38152cc1dc14f6d12fe448c900285' 
  AND token = '7JKDaLqnsXJASA6grnbSJzSbY1l1VSq+/JXxeBh2X7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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