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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1618c2fa87dad2b5af2db7e5732e8d2719458a605c8813739be2576b03c44da1' 
  AND token = 'M6sm7ZHI36Mxfje1CrDCrvFmXczWEZlFsItYt9o2iTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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