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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686406777c2bb02dc42f45dbfe8f5b92ff2d941db93ef9121b237a2e82f971ba' 
  AND token = 'YnQN7rwBB9sa7MblEMCRkbj72DQkY+A4g1+TbcwQmHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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