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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30766e8844123e557b5dbe861722d8ade6409ac6b5304d218a63ed3d5ea90291' 
  AND token = 'vivM/RvLynFttZ7SV8dIPoxqH97tgoTUxWwJ48dpWgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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