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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f7d888e1c1aab71b6eecab08967c306a65f795bc4a879a899fc40972f3ee5ad' 
  AND token = 'iUjSipViwOd/itOUSWoM3SWbXxo7MPuZvMhYLX3bbVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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