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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f38e3b97a1d53e558a0b4fe9a082115c486d7bba911433768b5d6ca3868dd6f' 
  AND token = 'Lak47pKcv92yiVRKV520ns6mAFMZNu4sIKeM+VnOkQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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