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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fdc5299a27bd3db60b2b6a5d61850cd4d0628ebf45c54fea8a001fcd74edfa' 
  AND token = 'MhiLOJy6S5dstZ1jgnU/EctFml2A86UCSXKA2nigf88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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