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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e62c8bd7d98ec8c6a34cbefd7bb277648a7295c0a92da76b2f4cc671068312b' 
  AND token = 'EukucRjNpF0byluLOy09J1ypv0CNrnmE+EOh4nLqpBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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