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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cec905d920170ff02f0944b4ccab8269a3c23bed56c0a114895a580ade27757' 
  AND token = 'fGQHUatqLX4fZwNAz9WzoGe0NpuBP1Sgg1e0kaEJpM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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